Long Time Stalker, First Time Poster!

Sweet ride!Welcome! Lots of folks here would kill to have a car that's "done"
I've got a 360 mpfi motor in my 73 Duster, but if I had a 340 that's what would be in there. The only "problem" I have with it is that tires only last 2,000 miles ;)
Personally I'd keep the stock exterior and spend $$ on the handling and interior upgrades. Lots of folks doing pro-touring builds these days.